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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Mon Jan 21, 2008 3:18 am Post subject: Hissing Barco 1100 |
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The green tube was hissing quite loudly so I changed the HT lead and this has reduced the noise but it still hisses. Should I be concerned?
KM
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r.bauer
Joined: 08 Apr 2006
Posts: 280
Location: The Netherlands
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| Posted: Mon Jan 21, 2008 9:49 am Post subject: |
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Has it started hissing recently, or not?
Unfortunately these tubes have a tendency to fail prematurely, that's why not many of them are around anymore. Long time ago my green tube went out and it hissed loudly because the gun was arcing. Was nice to watch, a kind of green/pink light emitted from the gun.
The lightoutput however from the SD146 tubes is fantastic, the image is very punchy. These are some of the brightest CRT-projectors around.
Also the cooling and airflow in the 1100 is not the best design I've seen. Has it the 'open chassis' where the warmed up air is blown towards the tubes? Reversing the airflow and better controlling it would be an improvement to this chassis in my opninion. Later models (BG808 and BG1200 and up) have reversed the airflow and improved the cooling of the convergence tray. Don't know if that will increase the tube life, but it might be worth trying.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Mon Jan 21, 2008 3:13 pm Post subject: |
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Hissing is always(?) an indication of HV arcing/leakage, and can't be considered 'good'.
Does it go away when you disconnect the HV lead at the splitter for the green tube?
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Mon Jan 21, 2008 10:39 pm Post subject: |
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I purchased the tube from another forum member and it has always hissed.
As I recall when you disconnect the red HT lead from the splitter the hissing stops. That was the reason that I changed the HT lead and when I did this the hissing reduced considerably but is still there.
KM
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Dave Lister
Joined: 16 Jan 2007
Posts: 436
Location: Adelaide, South Australia
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue Jan 22, 2008 3:48 am Post subject: |
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I did use silicon and I did remove as much of the old stuff as I could. Its possible some small amount of the old silicon did remain.
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